The Experts below are selected from a list of 14724 Experts worldwide ranked by ideXlab platform
Johan P Mackenbach - One of the best experts on this subject based on the ideXlab platform.
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Outdoor Air Temperature and mortality in the netherlands a time series analysis
American Journal of Epidemiology, 1993Co-Authors: Anton E Kunst, C W N Looman, Johan P MackenbachAbstract:The purpose of our study is to obtain indications on the mechanisms that underlie the association between Outdoor Air Temperature and mortality by means of a detailed analysis of this relation in the Netherlands from 1979 through 1987. The question that we addressed is whether this relation is largely attributable to direct effects on the human body of exposure to unfavorable Temperatures....If direct effects of cold and heat on the human body play an important role a subsequent question is to what extent such effects result in stress on the circulatory system. This will be examined by distinction of causes of death. It is reasonable to expect that cold- and heat-induced cardiovascular stress increases the death rates of patients with cardiovascular disease more than it does among other patients. (EXCERPT)
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Outdoor Air Temperature and mortality in the netherlands a time series analysis
American Journal of Epidemiology, 1993Co-Authors: Anton E Kunst, C W N Looman, Johan P MackenbachAbstract:Death rates become progressively higher when Outdoor Air Temperature rises above or falls below 20-25 degrees C. This study addresses the question of whether this relation is largely attributable to the direct effects of exposure to heat and cold on the human body in general, and on the circulatory system in particular. The association between daily mortality and daily Temperatures in the Netherlands in the period 1979-1987 was examined by controlling for influenza incidence, Air pollution, and "season"; distinguishing lag periods; examining effect modification by wind speed and relative humidity; and distinguishing causes of death. Important direct effects of exposure to cold and heat on mortality were suggested by the following findings: 1) control for influenza incidence reduced cold-related mortality by only 34% and reduced heat-related mortality by 23% (the role of Air pollution and "season" was negligible); 2) 62% of the "unexplained" cold-related mortality, and all heat-related mortality, occurred within 1 week; and 3) effect modification by wind speed was in the expected direction. The finding that 57% of "unexplained" cold-related mortality and 26% of the "unexplained" heat-related mortality was attributable to cardiovascular diseases suggests that direct effects are only in part the result of increased stress on the circulatory system. For heat-related mortality, direct effects on the respiratory system are probably more important. For cold-related mortality, the analysis yielded evidence of an important indirect effect involving increased incidence of influenza and other respiratory infections.
Dong Kurl Kwak - One of the best experts on this subject based on the ideXlab platform.
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study on the development of an optimal heat supply control algorithm for group energy apartment buildings according to the variation of Outdoor Air Temperature
Energies, 2012Co-Authors: Jae Ki Byun, Young Don Choi, Jong Keun Shin, Myung Ho Park, Dong Kurl KwakAbstract:In the present study, we have developed an optimal heat supply algorithm which minimizes the heat loss through the distribution pipe line in a group energy apartment. Heating load variation of a group energy apartment building according to the Outdoor Air Temperature was predicted by a correlation obtained from calorimetry measurements of all households in the apartment building. Supply water Temperature and mass flow rate were simultaneously controlled to minimize the heat loss rate through the distribution pipe line. A group heating apartment building located in Hwaseong city, Korea, which has 1473 households, was selected as the object building to test the present heat supply algorithm. Compared to the original heat supply system, the present system adopting the proposed control algorithm reduced the heat loss rate by 10.4%.
Jong Keun Shin - One of the best experts on this subject based on the ideXlab platform.
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study on the optimal heat supply control algorithm for district heating distribution network in response to Outdoor Air Temperature
Energy, 2015Co-Authors: Sun Joon Byun, Hyun Sik Park, Sung Jae Yi, Chul Hwa Song, Young Don Choi, Jong Keun ShinAbstract:In the present study, a heat supply control algorithm was developed that minimizes the rate of heat loss in the heat distribution lines of district heating community buildings. This algorithm simultaneously controlled the supply water Temperature and flow rate in response to the Outdoor Air Temperature to minimize the heat loss rate in a distribution line. The total heat supply through the distribution lines of community buildings in Hwaseong, Gyeonggi, South Korea, was compared with the total heat consumption of all households. It was revealed that 24.1% of the heat supply to the community buildings was lost in the distribution lines. By simultaneously controlling the supply water Temperature and flow rate in response to the Outdoor Air Temperature, the developed algorithm could reduce the heat loss by 11.5%.
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study on the development of an optimal heat supply control algorithm for group energy apartment buildings according to the variation of Outdoor Air Temperature
Energies, 2012Co-Authors: Jae Ki Byun, Young Don Choi, Jong Keun Shin, Myung Ho Park, Dong Kurl KwakAbstract:In the present study, we have developed an optimal heat supply algorithm which minimizes the heat loss through the distribution pipe line in a group energy apartment. Heating load variation of a group energy apartment building according to the Outdoor Air Temperature was predicted by a correlation obtained from calorimetry measurements of all households in the apartment building. Supply water Temperature and mass flow rate were simultaneously controlled to minimize the heat loss rate through the distribution pipe line. A group heating apartment building located in Hwaseong city, Korea, which has 1473 households, was selected as the object building to test the present heat supply algorithm. Compared to the original heat supply system, the present system adopting the proposed control algorithm reduced the heat loss rate by 10.4%.
Anton E Kunst - One of the best experts on this subject based on the ideXlab platform.
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Outdoor Air Temperature and mortality in the netherlands a time series analysis
American Journal of Epidemiology, 1993Co-Authors: Anton E Kunst, C W N Looman, Johan P MackenbachAbstract:The purpose of our study is to obtain indications on the mechanisms that underlie the association between Outdoor Air Temperature and mortality by means of a detailed analysis of this relation in the Netherlands from 1979 through 1987. The question that we addressed is whether this relation is largely attributable to direct effects on the human body of exposure to unfavorable Temperatures....If direct effects of cold and heat on the human body play an important role a subsequent question is to what extent such effects result in stress on the circulatory system. This will be examined by distinction of causes of death. It is reasonable to expect that cold- and heat-induced cardiovascular stress increases the death rates of patients with cardiovascular disease more than it does among other patients. (EXCERPT)
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Outdoor Air Temperature and mortality in the netherlands a time series analysis
American Journal of Epidemiology, 1993Co-Authors: Anton E Kunst, C W N Looman, Johan P MackenbachAbstract:Death rates become progressively higher when Outdoor Air Temperature rises above or falls below 20-25 degrees C. This study addresses the question of whether this relation is largely attributable to the direct effects of exposure to heat and cold on the human body in general, and on the circulatory system in particular. The association between daily mortality and daily Temperatures in the Netherlands in the period 1979-1987 was examined by controlling for influenza incidence, Air pollution, and "season"; distinguishing lag periods; examining effect modification by wind speed and relative humidity; and distinguishing causes of death. Important direct effects of exposure to cold and heat on mortality were suggested by the following findings: 1) control for influenza incidence reduced cold-related mortality by only 34% and reduced heat-related mortality by 23% (the role of Air pollution and "season" was negligible); 2) 62% of the "unexplained" cold-related mortality, and all heat-related mortality, occurred within 1 week; and 3) effect modification by wind speed was in the expected direction. The finding that 57% of "unexplained" cold-related mortality and 26% of the "unexplained" heat-related mortality was attributable to cardiovascular diseases suggests that direct effects are only in part the result of increased stress on the circulatory system. For heat-related mortality, direct effects on the respiratory system are probably more important. For cold-related mortality, the analysis yielded evidence of an important indirect effect involving increased incidence of influenza and other respiratory infections.
Shiming Deng - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of an integrated cooling system driven by both liquid refrigerant pump and vapor compressor
Energy and Buildings, 2017Co-Authors: Jiankai Dong, Yana Lin, Shiming Deng, Chao Shen, Zhuo ZhangAbstract:Abstract The energy consumption of Air conditioning system accounts for a significant proportion of the total energy consumed in data center. To reduce the energy consumption of the cooling system, an integrated system, which combines pumped refrigerant two-phase cycle (PRTC) with vapor compression cycle (VCC), is proposed in this paper. The impacts of input frequency and Outdoor Air Temperature on the performances of PRTC, and that of the Outdoor Air Temperature on the performances of VCC have been investigated. It was found that PRTC had higher EER than VCC, but its cooling capacity was limited by Outdoor Air Temperature. In PRTC, the designed cooling capacity of 2500 W could be obtained when the Outdoor Air Temperature was −3.0 °C. In addition, 80% and 50% of the designed cooling capacity can be obtained at ambient Temperatures 3.2 °C and 12.0 °C, respectively. Besides, the feasibility of the system in different climate zones in China was demonstrated by analysis of the climate data in Harbin, Beijing, Wuhan, Guangzhou and Guiyang, respectively. Results indicated the proposed system had high feasibility in Harbin and Beijing. The results of this paper can provide valuable insights into the cooling system driven by both liquid refrigerant pump (LRP) and vapor compressor, targeting at reducing the cooling energy consumption and maximizing the economic efficiency of the cooling system in data center.
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an experimental study on the indoor thermal environment in prefabricated houses in the subtropics
Energy and Buildings, 2016Co-Authors: Lei Wang, Yan Wang, Enshen Long, Shiming DengAbstract:Abstract Temporary prefabricated houses (PHs) can be effective in providing disaster victims with a temporary living place quickly whenever there is a natural disaster, and are also widely used in providing construction workers with living places. However, there are very limited studies on indoor thermal environment inside PHs, with their inadequacies. Therefore, an experimental study on the indoor thermal environments in an experimental PH located in the subtropics is reported in this paper. The study results suggested that at closed door and window situation, the Air Temperature inside the experimental PH was very high at daytime in summer, but very low at nighttime in winter. In addition, the variation of the Air Temperature inside the PH appeared synchronously with that of Outdoor Air Temperature at daytime in summer, suggesting insignificant thermal mass of envelope to store solar heat gain. Furthermore, in both winter and summer, indoor Air Temperature stratification was observed. At daytime, indoor Air Temperature was increased with the height but at nighttime, decreased with the height. Finally, external roof Temperatures in both winter and summer time were lower than Outdoor Air Temperature, reflecting sky cooling effects for the experimental PH. The measured thermal environments inside the experimental PH, clearly demonstrated that the thermal environments inside PHs are highly unacceptable for long term occupation and that appropriate measures should be taken to improve the thermal environments in PHs.
